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Vanadium-doped titanium-base flue gas denitration catalyst material and preparation method thereof

A catalytic material and doped technology, applied in the field of nitrogen oxide reduction catalytic materials, can solve the problems of limited popularization and application, high cost, and difficulty in obtaining pure-phase anatase structure titanium dioxide.

Inactive Publication Date: 2009-07-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of preparing anatase structure titanium dioxide carrier by sol-gel method, organic titanium salt is usually dissolved in organic alcohol solvent to prepare titanium sol, which needs to consume a large amount of organic alcohol solvent, and the cost is high, which limits this method. Promoted application of
The titanium dioxide carrier prepared by the sol-gel method of aqueous solution usually has poor thermal stability, and it is difficult to prepare pure phase anatase structure titanium dioxide

Method used

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  • Vanadium-doped titanium-base flue gas denitration catalyst material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 1.98g of vanadium oxalate solution (2mol / L) and 2.28g of hexadecyltrimethylammonium bromide into 100g of nitric acid aqueous solution with a concentration of 1mol / L and stir at room temperature for 100 minutes to prepare liquid A; drop 30g of acetic acid into 43.92 Add 4.5 g of formamide to the above sol, stir at room temperature for 10 minutes, and put aging in a water bath at 40°C to obtain a vanadium / titanium wet gel, and the obtained wet gel was aged at the same temperature for 3 days; the wet gel was taken out and dried in an oven at 60°C for 5 days to obtain a dry gel; The xerogel was heated in a muffle furnace at a rate of 2 °C / min to 250 °C for 2 hours, and then at a rate of 2 °C / min to 450 °C for 2 hours to prepare catalyst sample 1. The specific surface area of ​​catalytic material 1 measured by nitrogen adsorption / desorption method is 110.2m 2 / g; The catalytic material is an anatase structure as measured by X-ray diffraction.

Embodiment 2

[0016]Add 1g of polyethylene glycol (molecular weight 400) and 9.2g of vanadium oxalate solution (2mol / L) into 270g of nitric acid aqueous solution with a concentration of 0.1mol / L and stir at room temperature for 120 minutes to prepare liquid A; drop 72g of acetic acid into 102g of titanic acid Stir in butyl ester at room temperature for 30 minutes to prepare liquid B; add solution B to liquid A and stir vigorously for 20 minutes to obtain vanadium / titanium sol; add 7.5 g of formamide to the above sol, stir at room temperature for 20 minutes, and put Aging in a water bath to obtain a vanadium / titanium wet gel, and the obtained wet gel was aged at the same temperature for 3 days; the wet gel was taken out and dried in an oven at 60°C for 6 days to obtain a xerogel; the xerogel In the muffle furnace, the temperature was raised to 250°C at a rate of 2°C / min and kept for 2 hours, and then the temperature was raised to 450°C at a rate of 2°C / min for 2 hours to prepare catalyst samp...

Embodiment 3

[0018] Add 2g of polyethylene glycol (molecular weight 2000) and 4.6g of vanadium oxalate solution (2mol / L) into 270g of 0.5mol / L nitric acid aqueous solution and stir at room temperature for 120 minutes to prepare liquid A; drop 72g of acetic acid into 102g of titanic acid Stir in butyl ester at room temperature for 30 minutes to prepare liquid B; add solution B to liquid A and stir vigorously for 20 minutes to obtain vanadium / titanium sol; add 10 g of formamide to the above sol, stir at room temperature for 20 minutes, and place in a 40°C water bath aging to obtain a vanadium / titanium wet gel, and the obtained wet gel was aged at the same temperature for 3 days; the wet gel was taken out and dried in an oven at 60°C for 6 days to obtain a xerogel; In the muffle furnace, the temperature was raised to 250°C at a rate of 2°C / min and kept for 2 hours, and then the temperature was raised to 450°C at a rate of 2°C / min and kept for 2 hours to prepare catalyst sample 3. The specific...

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Abstract

The invention relates to a vanadium doping type titanium base fume denitration catalytic material and a preparation method thereof. The material is characterized in that a surface active agent is used as a pore structure guiding agent, a water solution system sol-gel method is used for preparing the vanadium doping type titanium base catalytic material, and the doping content of active component vanadium is 0.5 to 20wt percent measured by V2O5. Because an in-situ doping loading mode is adopted in the sol-gel process, the preparation method is simple, and the production cost is low; in addition, the prepared denitration catalytic material has larger specific surface area, higher heat stability, higher denitration efficiency and wider active temperature window, and is suitable for the field of removal of coal-fired fume nitrogen oxide. The laboratory simulation fume evaluation shows that when the air speed is 10,000 / h, and under the condition that the content of NO is 1000ppm, the removal rate of NO achieves more than 95 percent at the temperature of 180 to 420 DEG C.

Description

technical field [0001] The invention belongs to the technical field of nitrogen oxide reduction catalytic materials, and in particular relates to a high specific surface area vanadium-doped flue gas denitrification catalytic material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the development and utilization of coal has brought serious pollution to the environment. In particular, coal-fired power plant boilers emit a large amount of sulfur dioxide and nitrogen oxides, which further aggravates the deterioration of the environment. China is a big coal-burning country, and 76% of primary energy consumption is coal. By 2005, my country's annual coal output will reach 2 billion tons, half of which will be used in coal-fired power plants. my country's coal-fired emissions of SO2 and NOx account for 89% of the total emissions. % and 67%. Therefore, the emission control of SO2 and NOx in coal-fired flue gas has b...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J21/06B01J37/00B01J37/08B01D53/56
Inventor 吴俊升李晓刚张新杨仁春董超芳
Owner UNIV OF SCI & TECH BEIJING
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